Observed X/O abundance pattern from the broad-band spectral fits, where the medians and 16–84th percentile ranges for all dispersion angles are plotted. Two literature values from previous RGS works are given for comparison. The dashed line represents the solar composition. The solid thick and thin lines indicate the IMF-weighted yields predicted by Nomoto et al. (2013) and Sukhbold et al. (2016), respectively, assuming initially solar metallicity for the progenitors. The dashed lines are for each option of the mass-cutoff integration (< 25 M_⊙).